a. This change took place only when αι was followed by ϝ (αἰϝεί, αἰϝετός from ἀϝιετος, κλαιϝει from κλαϝιει, 111, cross128) or ι (Θηβα_ίςthe Thebaïd from Θηβαιίς); and only when ϝ or ι was not followed by ο.